Hi!
First, a comment from haskell-land:
http://www.haskell.org/pipermail/haskell-cafe/2008-June/044533.html
http://www.haskell.org/pipermail/haskell-cafe/2008-June/thread.html#44379
Thanks for the links, very interesting. Even a couple of comments in the
thread going beyond "PHP sucks" and really discussing the matter. :)
Best account is this:
* A closure must only keep alive the varables it references, not the
whole pad on which they are allocated
[Check]
* A closure must be able to call itself recursively (via a
higher-order function typically)
[Check, since you can use variable you assigned closure to inside the
closure, if I understand correctly]
* Multiple references to the same body of code with different bindings
must be able to exist at the same time
[Check]
* Closures must be nestable.
[Dunno - does the patch allow nesting and foo(1)(2)?]
Getting the same behaviour out of PHP should not be as difficult as this:
Well, I don't see any other way if you use references. Variables _are_
mutable in PHP. You could, of course, use copies, but then you'd lose
ability to update. Maybe if we drop "lexical" and use Dmitry's proposal of
$arr[$i] = function () ($i) { return $i; };
where ($i) would be copy, (&$i) would be by-ref, then it'd be easier to
control it. I know function()() is weird, but not everybody likes
lexical either :) Maybe we can do lexical &$y, but that looks weird too...
Of course this would make lexical behave quite differently from global in this
I wouldn't spend too much thought on making lexical work like global.
global is for different purpose (and with $GLOBALS is obsolete anyway :)
--
Stanislav Malyshev, Zend Software Architect
[EMAIL PROTECTED] http://www.zend.com/
(408)253-8829 MSN: [EMAIL PROTECTED]
--
PHP Internals - PHP Runtime Development Mailing List
To unsubscribe, visit: http://www.php.net/unsub.php
